4 outputs, Outputs – Pilz PSSu K F FCU User Manual
Page 13
Function description
Operating Manual PSSu K F FCU
1002391-EN-04
13
Outputs
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2 dual-pole digital outputs (cannot be used as a single-pole output)
NOTICE
Risk from high discharge voltage!
The discharge voltage when switching off an inductive load is up to -185 V.
The connected load can be damaged by the discharge voltage.
– Limit the discharge voltage if the connected load can be damaged by
this discharge voltage.
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2 single-pole digital outputs
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The max. capacity at an output depends on the load (see characteristic). Connecting a
higher capacity may lead to an error.
Open circuit detection (only on dual-pole outputs):
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The module will detect an open circuit between outputs O0x+ and O0x-.
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The result of open circuit detection is signalled as an output error.
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Loads over 0,17 kOhm may mistakenly be detected as an open circuit.
Output test
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Outputs that are switched on are checked via regular off tests.
– Test pulses for outputs that are switched on: see
– Outputs that are switched on are switched off for the duration of the test pulse.
– The load must not switch off because of the test.
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Outputs that are switched off are checked via regular on tests (only on single-pole out-
puts).
– Test pulses for outputs that are switched off: see technical details
– Outputs that are switched off are switched on for the duration of the test pulse.
– The load must not switch on because of the test.
Excluding individual outputs from the output test (only on single-pole outputs):
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If a plant is particularly sensitive to the test pulses, the output test may be switched off
for individual outputs.
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The test must be replaced by other measures, depending on the safety requirement.
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When test pulses are switched off:
– The correct switch status is always checked.
– The output's ability to switch will not be detected until the next time the output is
switched on/off.
Testing for shorts
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A test is regularly carried out to check for shorts between the outputs.
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For applications in accordance with Category 4, PL e and SIL 3, detection of shorts be-
tween contacts must be guaranteed either via the on/off test or through other measures
(e.g. asynchronous switching). A short between contacts must be simulated during
commissioning.
4.4